Cement based electromagnetic shielding and absorbing building materials

Guan, Hongtao; Liu, Shunhua; Duan, Yuping; Cheng, Jianmei

doi:10.1016/j.cemconcomp.2005.12.004

Cited by 252 publications

(108 citation statements)

References 54 publications

(48 reference statements)

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“…El comportamiento de apantallamiento EMI se evaluó a través del parámetro de apantallamiento (S) y este resultado se corresponde con la media de los valores obtenidos en los sentidos de incidencia de la radiación sobre la probeta. El apantallamiento EMI (S) se calculó mediante la Ecuación 1 (20), donde I e es la intensidad de la radiación Función de apantallamiento de interferencia electromagnética de pastas de cemento con materiales carbonosos y cenizas volantes procesadas Electromagnetic interference shielding with Portland cement paste containing carbon materials and processed fly ash The specimens were cast and subsequently cured in copper moulds for 28 days in a humidity chamber at 100% relative humidity and 20 ºC. Thereafter, the moulded specimens were anchored to an EMI measurement cell and tested to determine paste shielding performance ( Figure 2).…”

Section: Methodsunclassified

“…The EMI shielding performance (S) values shown are the mean of the measurements obtained in the direction of the incident radiation. EMI shielding (S) was calculated from Equation 1 (20), where I e is the intensity of the radiation emitted and I r is the intensity of the radiation received by the network analyzer. Further to the set-up diagram in Figure 2, which had been used in prior studies (17,23), radiation was emitted by one of the network analyzer ports onto the specimen surface (where a certain portion Tabla 3 / Table 3 Dosificaciones de las probetas ensayadas.…”

Section: Methodsmentioning

confidence: 99%

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Función de apantallamiento de interferencia electromagnética de pastas de cemento con materiales carbonosos y cenizas volantes procesadas

et al. 2010

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RESUMENEn el presente trabajo se investiga la influencia de la adición de diferentes tipos de materiales carbonosos (polvo de grafito y 3 tipos de fibra de carbono), de una ceniza volante con diferentes contenidos de fase magnética (5,6%, 15,9% y 24,3% de Fe 2 O 3 ) y de una mezcla de ambos, sobre la capacidad de apantallar interferencias electromagnéticas de pastas de cemento Pórtland. Entre los parámetros estudiados se encuentra: el tipo de material carbonoso, la relación de aspecto del material carbonoso, el espesor del material compuesto, la frecuencia de la radiación electromagnética incidente y el porcentaje de fracción magnética en la ceniza volante. Los resultados obtenidos indican que entre los materiales carbonosos estudiados son las fibras de carbono basadas en poliacrilonitrilo con una mayor relación de aspecto las que dan mejores resultados de apantallamiento. Al aumentar el espesor del material compuesto o la frecuencia de radiación también aumenta la eficacia del apantallamiento. En lo que respecta a la ceniza volante, el incremento de la fracción magnética de la ceniza incrementa el nivel de apantallamiento. No obstante, los resultados más eficaces se obtienen por la adición conjunta de fibras de carbono y ceniza volante debido a un efecto sinérgico.Palabras clave: Apantallamiento EMI, pasta de cemento, ceniza volante procesada, fibra de carbono, polvo de grafito. ABSTRACTThe study described in this article explored the effect of adding different types of carbon materials (graphite powder and three types of carbon fibre), fly ash (with 5.6%, 15.9% and 24.3% Fe 2 O 3 ), and a mix of both on electromagnetic interference (EMI) shielding in Portland cement pastes. The parameters studied included the type and aspect ratio of the carbonic material, composite material thickness, the frequency of the incident electromagnetic radiation and the percentage of the magnetic fraction in the fly ash. The findings showed that the polyacrylonitrile-based carbon fibres, which had the highest aspect ratio, provided more effective shielding than any of the other carbon materials studied. Shielding was more effective in thicker specimens and at higher radiation frequencies. Raising the magnetic fraction of the fly ash, in turn, also enhanced paste shielding performance. Finally, adding both carbon fibre and fly ash to the paste resulted in the most effective EMI shielding as a result of the synergies generated.Keywords: EMI shielding, cement paste, processed fly ash, carbon fibre, graphite powder. Persona de contacto/Corresponding author: pedro.garces@ua.es INTRODUCCIÓNLos materiales cementantes tienen una gran importancia en el campo de la ingeniería estructural debido a sus propiedades mecánicas, buena durabilidad y bajo coste. Sin embargo, durante los últimos años, se está haciendo un esfuerzo para aumentar la funcionalidad de este material estructural y obtener un mayor rendimiento del mismo (1). Esta investigación se ha enfocado en la mejora del apantallamiento de interferencia electromagnética (EMI) ofrecida po...

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Section: Methodsunclassified

Section: Methodsmentioning

confidence: 99%

Función de apantallamiento de interferencia electromagnética de pastas de cemento con materiales carbonosos y cenizas volantes procesadas

et al. 2010

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“…Consequently, human and electrical/electronic equipment will be exposed to unwanted electromagnetic energy which might results in disastrous consequences such as incurable illnesses and malfunction of machine or systems resulting in death []. There are mainly two methods to prevent and attenuate EMI radiation, which are shielding and absorption' Commonly, shielding materials introduce higher reflection loss as it is closely related to the conductivity of the material' whereas for the absorbing materials, it possess higher complex permeability which able to provide more absorption loss [2]. This paper discusses the characteristic of spinel nickel-zinc ferrite (Nis.5Zn6 5FezO+) fig.…”

Section: Introductionmentioning

confidence: 99%

Characterization of Nickel-Zinc Ferrite Powder Prepared via Sol-Gel Technique in between 100 MHz to 2 GHz

Yee

Kiong

Jenu

2013

AMM

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“…Various materials can be used to increase the electromagnetic shielding: a review of suitable materials can be found in [2]. The additives are commonly divided into two categories, metal filling cement materials and carbon filling cement materials.…”

Section: Introductionmentioning

confidence: 99%

Modeling Shielding Effectiveness for Composite Walls of Concrete and Carbon Filaments

Ellgardt

Månsson²

2013

PIER M

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Abstract-Concrete walls reinforced with rebars have poor shielding effectiveness for telecommunication frequencies (frequencies above 0.5 GHz). An effective method to increase the shielding effectiveness of the walls is to increase the complex permittivity of the concrete. This can be done by mixing in thin filaments of a material with high conductivity. One such material is carbon. In this paper the Maxwell Garnett mixing rule is used to model a concrete material with carbon filaments. The shielding effectiveness computed with the mixing rule is found to agree with previously published measurement results.

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Cement based electromagnetic shielding and absorbing building materials

Cited by 252 publications

References 54 publications

Función de apantallamiento de interferencia electromagnética de pastas de cemento con materiales carbonosos y cenizas volantes procesadas

Función de apantallamiento de interferencia electromagnética de pastas de cemento con materiales carbonosos y cenizas volantes procesadas

Characterization of Nickel-Zinc Ferrite Powder Prepared via Sol-Gel Technique in between 100 MHz to 2 GHz

Modeling Shielding Effectiveness for Composite Walls of Concrete and Carbon Filaments

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